What Freediving Into a Blue Hole Abyss Looks Like

  Watch freediver Guillaume Néry plunge deep into a blue hole abyss off the coast of Long Island, Bahamas. A “blue hole” is a term for a water-filled sinkhole with an entrance below water level. Seen here is Dean’s Blue Hole, the world’s deepest known salt water blue hole. It plunges 202 metres (663 ft)…